Antibiotic A/16686 factor A.sub.2, the process for the preparation thereof and the co-produced antibiotic A/16686 factors A.sub.1 and A.sub.3

Granted: Jan 24, 1984 Filed: Jul 31, 1981

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.